#app {
  width: 10.14rem;
  margin: 0 auto;
}
#app .main {
  width: 100%;
}
#app .main .main-img {
  width: 100%;
}
#app .adv {
  position: absolute;
  top: 0.3rem;
  left: 0.3rem;
}
.toTop {
  width: 0.5rem;
  height: 0.5rem;
  position: fixed;
  right: 0.3rem;
  bottom: 0.5rem;
  background-color: #ddd;
  text-align: center;
  display: none;
}
